Template:Third Trimester Timeline
From Embryology
human timeline | first trimester timeline | second trimester timeline | third trimester timeline | ||
Event | ||
Clinical third trimester | hearing 3rd Trimester - vibration acoustically of maternal abdominal wall induces startle respone in fetus. | |
respiratory Month 7 - respiratory bronchioles proliferate and end in alveolar ducts and sacs | ||
tooth Week 29 - Permanent premolars (correspond to the milk molars) appear. | ||
Genital male gonad (testes) descending | ||
nail fingernails reach digit tip | ||
neural brain cortical sulcation - primary sulci present[1] | ||
neural brain cortical sulcation - insular, cingular, and occipital secondary sulci present[1] | ||
Nail Development toenails reach digit tip
Lens Development - lens growth and interocular distance plateaus after 36 weeks of gestation[2] | ||
Birth | Clinical Week 40
Heart pressure difference closes foramen ovale leaving a fossa ovalis thyroid TSH levels increase, thyroxine (T3) and T4 levels increase to 24 h, then 5-7 days postnatal decline to normal levels adrenal - zona glomerulosa, zona fasiculata present
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- ↑ 1.0 1.1 Garel C, Chantrel E, Brisse H, Elmaleh M, Luton D, Oury JF, Sebag G & Hassan M. (2001). Fetal cerebral cortex: normal gestational landmarks identified using prenatal MR imaging. AJNR Am J Neuroradiol , 22, 184-9. PMID: 11158907
- ↑ Paquette LB, Jackson HA, Tavaré CJ, Miller DA & Panigrahy A. (2009). In utero eye development documented by fetal MR imaging. AJNR Am J Neuroradiol , 30, 1787-91. PMID: 19541779 DOI.